Calculation of Energetic and Biochemical Equivalents of Respiratory Oxygen Consumption

Gnaiger, Erich

doi:10.1007/978-3-642-81863-9_30

Cited by 365 publications

(274 citation statements)

References 5 publications

Supporting

Mentioning

271

Contrasting

Unclassified

Order By: Relevance

“…This RQ is the ratio of carbon dioxide produced to oxygen consumed. A value of 1 was assumed for the RQ for all animals, based on values for carbohydrate metabolism from Prosser (1961) and Gnaiger (1983) (reviewed by Ikeda et al 2000).…”

Section: Analytical Proceduresmentioning

confidence: 99%

Increased carbon dioxide availability alters phytoplankton stoichiometry and affects carbon cycling and growth of a marine planktonic herbivore

et al. 2012

View full text Add to dashboard Cite

Rising levels of CO 2 in the atmosphere have led to increased CO 2 concentrations in the oceans. This enhanced carbon availability to the marine primary producers has the potential to change their nutrient stoichiometry, and higher carbon-to-nutrient ratios are expected. As a result, the quality of the primary producers as food for herbivores may change. Here, we present experimental work showing the effect of feeding Rhodomonas salina grown under different pCO 2 (200, 400 and 800 latm) on the copepod Acartia tonsa. The rate of development of copepodites decreased with increasing CO 2 availability to the algae. The surplus carbon in the algae was excreted by the copepods, with younger stages (copepodites) excreting most of their surplus carbon through respiration and adult copepods excreting surplus carbon mostly as DOC. We consider the possible consequences of different excretory pathways for the ecosystem. A continued increase in the CO 2 availability for primary production, together with changes in the nutrient loading of coastal ecosystems, may cause changes in the trophic links between primary producers and herbivores.

show abstract

Section: Analytical Proceduresmentioning

confidence: 99%

Increased carbon dioxide availability alters phytoplankton stoichiometry and affects carbon cycling and growth of a marine planktonic herbivore

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Ash-free dry weight (AFDW) was computed as: AFDW = DW -ASH. The energy content was calculated by using the formula of Gnaiger (1983), amended by Gnaiger and Shick (1985): J = 66.265W c + 4.436W n -11.2, where J is an energy content in J mg -1 AFDW, and W c and W n are fractions of C and N, respectively, on an AFDW basis. J was expressed also as J mg -1 DW (= J mg -1 AFDW×AFDW/DW).…”

Section: Analytical Proceduresmentioning

confidence: 99%

Chemical composition and energy content of deep-sea calanoid copepods in the Western North Pacific Ocean

Ikeda

Yamaguchi

Matsuishi

2006

Deep Sea Research Part I: Oceanographic Research Papers

View full text Add to dashboard Cite

Condition factor index [CFI=1000×DW/(PL) 3 ; DW: dry weight, PL: prosome length], water content, carbon (C), nitrogen (N), ash and energy content were determined on a total of 69 copepod species caught from the mesopelagic (500-1000 m), upper-bathypelagic (1000-2000 m), lower-bathypelagic (2000-3000 m) and abyssopelagic (3000-5000 m) zones of the western subarctic Pacific. Resultant data were grouped into these four sampling zones, four developmental stage/sex categories (C4, C5 and C6 females and males), three feeding types (carnivore, detritivore and suspension feeder), or two reaction speed groups by the presence/absence of myelinated sheath enveloping axons (fast and slow reacting species). Zone-structured data showed the overall ranges were 3.8-4.6 mm for PL, 1.6-2.6 mg for DW, 21.4-25.0 for CFI, 75.0-78.6% of wet weight (WW) for water, 51.3-53.7% of DW for C, 7.7-8.8% of DW for N, 6.2-7.0 (by weight) for C/N, 6.9-9.6% of DW for ash and 25.3-27.4 J mg -1 DW for energy. Among these components, N and ash exhibited significant between-zone differences characterized by gradual decrease downward for the former, and only the upper-bathypelagic zone > abyssopelagic zone for the latter.Stage/sex-structured data showed no significant differences among them, but energy content of C5 was higher than that of C6 females. From the analyses of feeding

show abstract

“…Equivalency values were calculated for each diet on the basis of the biochemical content (Webster and Lovell, 1990). The biochemical content of the biofilm extract could not be calculated so a generalized oxycaloric value of 450.0 [kJ (mol oxygen) 21 ] was used (Gnaiger, 1983). Because crabs starved for short periods of time predominantly use carbohydrate reserves the oxygen consumption rates of control crabs were converted to energy expenditures using the oxycaloric value of 472.64 kJ (mol oxygen) 21 (Wallace, 1973;Vinagre and De Silva, 1992).…”

Section: Methodsmentioning

confidence: 99%

“…The energy budget of any animal can be reasonably measured by assessing oxygen consumption and ammonia excretion (Gnaiger, 1983). Changes in metabolic rates are the result of the physiological energy demands of ingestion, digestion, absorption, excretion, and growth of new tissues (Jobling et al, 1993).…”

mentioning

confidence: 99%

Metabolism, Consumption Rates, and Scope for Growth of Porcelain Crab (Petrolisthes galathinus)

McGlaun

Withers

2012

goms

View full text Add to dashboard Cite

Calculation of Energetic and Biochemical Equivalents of Respiratory Oxygen Consumption

Cited by 365 publications

References 5 publications

Increased carbon dioxide availability alters phytoplankton stoichiometry and affects carbon cycling and growth of a marine planktonic herbivore

Increased carbon dioxide availability alters phytoplankton stoichiometry and affects carbon cycling and growth of a marine planktonic herbivore

Chemical composition and energy content of deep-sea calanoid copepods in the Western North Pacific Ocean

Metabolism, Consumption Rates, and Scope for Growth of Porcelain Crab (Petrolisthes galathinus)

Contact Info

Product

Resources

About